[DRILL-7877] Streaming REST API Fails to Send Multiple Batches

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 1.19.0
• Fix Version/s: 1.19.0
• Component/s: Client - HTTP
• Assignee: Charles Givre
• Reporter: Charles Givre
• Reviewer: Paul Rogers
• Created: 14/Mar/21 04:48
• Updated: 28/Mar/21 03:46
• Resolved: 28/Mar/21 03:46

Description

The new streaming API appeared to have a minor bug for queries containing aggregates or anything complicated.

When queries produced multiple batches, if you attempted to view these results, the first batch would only contain the schema in the first batch and no rows. The reader would then send additional batches, but no rows. This can be verified using Drill 1.19 and executing the following query:

SELECT position_title, COUNT(*) as pc 
FROM cp.`employee.json` 
GROUP BY position_title